Printing roller



"Dem 1s, 1930. cmnm '1,785,673

' Y PRINTING ROLLER med April :50,Y 1920 gwumtoz Charles Catrcm s Patented Dwi I16,1930 y y uNlTEDsTATEs 'cir-mamas caminar, orfAxnoN, omo,4 assm'non. rornneoonnanh'rmr conrm, or Axnon, omo, a concurren or omo a `mrmalm.

mamme norman i appunti@ ma 'Aira sama. im n'. man;

My invention relates to rinting lmachinery, and it has articular re ation to rolls for distributing in in printing presses.

f An object of the invention is toprovide an `s improved resilient rollfhaving its end pory tions more flexible thanV the intermediate portions thereof.

Heretofore, the rubber rolls employed for;

distributing ink `inprinting presses either have had plane end surfaces or conical end 7 surfaces progrossivle projecting outwardly fv from the ends thereo In operating rolls of either of the aforesaid types, ink notv only spread'over'the printing mechanism enga lling surface thereof, but beyond the en s 'Somev thereof u` on the end'faceslof the roll. of the in was absorbed by the rubber com- I vposing the roll, and swelling resulted because ofthe presence of oil andother'rubber soli vents in the ink.'k This swelling of the roll lwas vdoubly pronounced adjacent lthe ends thereof, `because .both the peripheral surface `of the roll adjacentthe ends, `and the end faces, absorbedsome lof, the ink.` lConse- ,25 quently, the endsof the roll became enlargedr withy respect tothe intermediate. portions .s thereof'. s Thus, duringthe periods of operation of the roll, it was necessary continuously to compress the peripheral end surfaces of the roll into alignment with'lthe intermediate portions thereof. The continuous compression Vof the end portions ofthe rollgenerated specification, of which: l Figure 1 is an elevational view of a printing roll constructed according to one form of the invention; y i ,y FiguresrZ, 3, 4 and 5 are other forms of the of the roll 10 is inwardl. beveled, as indicated -,more flexible andmay f considerable heat in the roll, and caused ex-y 19, having radii of curvature substantially panying drawings,`forming a part of the shaft` 11,` projecting beyond theends ofthe rollk 10,1'are'ada ted't'o' be 'mounted in suitable bearings (nots own). Each of the end faces at 15, so that'the lengt of the roll yadjll'caent 'lr'thej'sha'ft is less than'the len h ofthe outer peripheral surface'thereof.

r y y constructing the roll in this manner the ends thereof are be forced radially in- ,wardly with littleeort. Thus, if the` ends of the roll become distorted byfswelling'action caused bythe absorption of ink, only a slight force is necessary to press the ends of the ,roll

into ali nient withintermediate portions of the perlpheral "surface l thereof.

In the embodiment of the invention shown igure 2, each end facs ofthe rollis Aprovidedjwith an internally p'ro`ectin` .beveled surface 16 and a crvedsur ace 1 joining the beveled surface with the peripheral surface of the roll. i n i Figure 3 illustrates a form ofthe invention similar to that shown by Figure 2",;in which a plane surface 18 joins the surface 16 and the outer surface of the Doll; s i i According to the construction shown by Figure 4, the ends ofthe roll are provided with centrally disposed cylindrical apertures less than the radius the roll'. v

Figure 5 shows an embodiment of the invention in which an annular groove 21 is`l formedbin eachjend face of the roll. In contrast to the costructions previously described, y this form of the invention provides a centrally dis osed protruding rtion22, the outer end o which substantlal is disposed within the plane of the outer endv of the roll.

In all of the constructions illustrated, it will be a parent that the ends of the roll are readily exible in a radial direction. Thus, even though the ends of the roll become distorted by swelling, only a slight amount of of the outer surface of eled depression'thereinp f 5j. yA printing-Troll composed ofl rubber compound, havin endy portions more flexible ,Y

energy; is dissi ated in movin them into Yalignment Wit the intermediate surface thereofu Consequently, the lesser amountof heat generated in the roll will be negligible, and the weaibnthefbearings supportingthe 4 shaft' 11, likewise,` wi11'"-be' oomparatively small. i v

vAlthough I have illustratedonly the pre- .l 7 :.7 j 'ferred forms which the invention'mayassume f and have described `those'formsin detail, it

will be apparent to those skilled in' the arto is.y that the invention is not solimited, but that f various minor modifications' ma be made therein'without de arting from t e spirit of vthe invention'ox"k r'omjthe soopeofthe apl 'l pended claimsf l y12Aprinting rollvfoi'me'd of ifeslilient'ii'ierialgf-having'end'poijtions more fiexiblefthan the intermediate potionsofthe'roll. l -4 --ag'agApnmtingfdlimmessiresilientmate;Y g rial',r theend faoe'softhe'roll 'being formed withfdepressions to'4 provide greater` fiexibilityiin-ftheend portions ofthe roll. f;

"rieb the len h of the peripheral'surfaoe "of theroll'para lelto its axis bein greaterfthan thelength of other portions o the rollpar- ,allelto the latter. f' f Q i4; vvAlnfinting rollformed of resilient inateteriaLeach end face 'of the roll having a bev-' than the interme late portions ofthe roll.;

lGQA printngmoll Composed ofirnbber ,I i `ooinp'ound;the'jed facesof the' ro11 being Y formed WithdePl'BSSiOnS to provide "eaten iexibility in the e'ndpoi'tions of the ro e In witnesswhemoi,1have hereunmigned my name.

'-sQAfprinting roll f rmed of res'hent matesigne@ Arran',neheepht-pflsnmmit, 1: i

@ARLES 0mm 1 l 

